diff options
| author | Damien Bergamini <damien@cvs.openbsd.org> | 2007-08-23 16:59:33 +0000 |
|---|---|---|
| committer | Damien Bergamini <damien@cvs.openbsd.org> | 2007-08-23 16:59:33 +0000 |
| commit | ec2abfcab406c3cde7bb626c18e18f38838d533e (patch) | |
| tree | c9dd32a5797513bdf924ae2c3b323902f507d8fc /sys | |
| parent | c84959746f5ee4d419f7271daada4eeb9febca49 (diff) | |
add ieee80211_get_hdrlen() to compute the size of the 802.11 header
of a management or data frame (check if the i_qos, i_ht or i_addr4
are present).
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/net80211/ieee80211_input.c | 27 | ||||
| -rw-r--r-- | sys/net80211/ieee80211_proto.h | 3 |
2 files changed, 28 insertions, 2 deletions
diff --git a/sys/net80211/ieee80211_input.c b/sys/net80211/ieee80211_input.c index 89e9dd5ce5e..69d97a98df8 100644 --- a/sys/net80211/ieee80211_input.c +++ b/sys/net80211/ieee80211_input.c @@ -1,5 +1,5 @@ /* $NetBSD: ieee80211_input.c,v 1.24 2004/05/31 11:12:24 dyoung Exp $ */ -/* $OpenBSD: ieee80211_input.c,v 1.65 2007/08/23 16:53:51 damien Exp $ */ +/* $OpenBSD: ieee80211_input.c,v 1.66 2007/08/23 16:59:32 damien Exp $ */ /*- * Copyright (c) 2001 Atsushi Onoe * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting @@ -116,6 +116,31 @@ void ieee80211_recv_eapol_key_req(struct ieee80211com *, const struct ieee80211_eapol_key *, struct ieee80211_node *); /* + * Retrieve the length in bytes of a 802.11 header. + */ +u_int +ieee80211_get_hdrlen(const void *data) +{ + const u_int8_t *fc = data; + u_int size = sizeof(struct ieee80211_frame); + + /* NB: doesn't work with control frames */ + KASSERT((fc[0] & IEEE80211_FC0_TYPE_MASK) != IEEE80211_FC0_TYPE_CTL); + + if ((fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS) + size += IEEE80211_ADDR_LEN; /* i_addr4 */ + if ((fc[0] & (IEEE80211_FC0_TYPE_MASK | IEEE80211_FC0_SUBTYPE_QOS)) == + (IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS)) { + size += sizeof(u_int16_t); /* i_qos */ + if (fc[1] & IEEE80211_FC1_ORDER) + size += sizeof(u_int32_t); /* i_ht */ + } else if ((fc[0] & IEEE80211_FC0_TYPE_MASK) == + IEEE80211_FC0_TYPE_MGT && (fc[1] & IEEE80211_FC1_ORDER)) + size += sizeof(u_int32_t); /* i_ht */ + return size; +} + +/* * Process a received frame. The node associated with the sender * should be supplied. If nothing was found in the node table then * the caller is assumed to supply a reference to ic_bss instead. diff --git a/sys/net80211/ieee80211_proto.h b/sys/net80211/ieee80211_proto.h index a778c85a553..fd43c0c49a3 100644 --- a/sys/net80211/ieee80211_proto.h +++ b/sys/net80211/ieee80211_proto.h @@ -1,4 +1,4 @@ -/* $OpenBSD: ieee80211_proto.h,v 1.26 2007/08/03 16:51:06 damien Exp $ */ +/* $OpenBSD: ieee80211_proto.h,v 1.27 2007/08/23 16:59:32 damien Exp $ */ /* $NetBSD: ieee80211_proto.h,v 1.3 2003/10/13 04:23:56 dyoung Exp $ */ /*- @@ -57,6 +57,7 @@ extern void ieee80211_proto_attach(struct ifnet *); extern void ieee80211_proto_detach(struct ifnet *); struct ieee80211_node; +extern u_int ieee80211_get_hdrlen(const void *); extern void ieee80211_input(struct ifnet *, struct mbuf *, struct ieee80211_node *, int, u_int32_t); extern int ieee80211_output(struct ifnet *, struct mbuf *, struct sockaddr *, |